[rawalbaig]

Looks nice monitoring service.
Though I prefer netdata as it's free, open source and comes with many features..
https://github.com/firehol/netdata

Good recommendation, NodeQuery is also a free service.

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Haha nodequery look like a good service but i'll  prefer netdata or a custom one for system performance and for downtimes i think a cron job will do the work.

This is completely on your personal preferences. Mostly people don't need in-depth monitoring. They only need basic performance reports like Network usage, Network Latency, Average Load, RAM and Disk usage etc. And I think NodeQuery will be a very good choice for them.